1. The rated voltage and rated current of each side of the transformer are not equal. Therefore, the models of the current transformers on each side must be different, and the three-phase wiring methods on each side are not the same, so the phase of each phase current may be inconsistent, which will make The unbalanced current increases when the external short circuit occurs, so the maximum coefficient of the transformer differential protection is larger than that of the generator, and the sensitivity is relatively low.
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2, transformer windings often have voltage regulating taps, and some require load regulation, so that the secondary current of the transformer differential protection has been adjusted and balanced, and the unbalanced current is increased, which will minimize the transformer differential protection. The operating current and braking coefficient must be increased accordingly.
3. For the inter-turn short circuit of the stator winding, the generator longitudinal differential protection has no effect at all. The inter-turn short circuit of each side winding of the transformer changes the magnitude and phase of the current on each side through the coupling of the magnetic circuit of the transformer core, so that the transformer longitudinal differential protection has an effect on the inter-turn short circuit.
4. Regardless of the open-welding faults of the transformer windings or the generator stator windings, their complete differential protection does not play a protective role, but the transformer can also rely on gas protection or pressure protection.
5. The transformer longitudinal protection range includes the core of the transformer in addition to the windings on each side, that is, not only the circuit but also the magnetic circuit in the transformer longitudinal protection zone, which obviously violates the theoretical basis of the differential protection (Kirchhof current) law). The generator's differential protection object has only the connection of the circuit. When there is no fault, the vector sum of each phase current is zero regardless of any external fault.
